package com.yueshop.cart.interceptor;

import com.yueshop.cart.vo.UserInfoTo;
import com.yueshop.common.constant.AuthConstant;
import com.yueshop.common.constant.CartConstant;
import com.yueshop.common.vo.MemberRespVo;
import org.apache.commons.lang.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.UUID;

/**
 * z作用: 在执行目标方法之前,判断用户是否登录了, 将封装的用户是否登录 临时用户信息 传递给 目标方法 controller方法
 */
public class CartInterceptor implements HandlerInterceptor {
    public static ThreadLocal<UserInfoTo> threadLocal =new ThreadLocal<>();
    //在目标方法执行之前拦截
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        UserInfoTo userInfoTo = new UserInfoTo();
        HttpSession session = request.getSession();
        MemberRespVo attribute = (MemberRespVo) session.getAttribute(AuthConstant.LOGIN_USER);
        if(attribute!=null){ //已经登录了
            userInfoTo.setUserId(attribute.getId());
        }
        Cookie[] cookies = request.getCookies();

        if(cookies!=null&&cookies.length>0){
            for (Cookie cookie : cookies) {
                String name = cookie.getName();
                //拿到cookie名字判断如果是userKey 就复制到userInfoTo 对象
                if(name.equals(CartConstant.TEMP_USER_COOKIE_NAME)){
                    userInfoTo.setUserKey(cookie.getValue());
                    userInfoTo.setTemp(true);
                }
            }
        }
        //如果没有临时用户, 就分配一个临时用户
        if(StringUtils.isEmpty(userInfoTo.getUserKey())){
            String uuid = UUID.randomUUID().toString();
            userInfoTo.setUserKey(uuid);
        }

        threadLocal.set(userInfoTo);
        return true;
    }

    //在业务执行之后, 执行的方法  让浏览器保存 user-key
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        UserInfoTo userInfoTo = threadLocal.get();
        if(!userInfoTo.isTemp()){
            Cookie cookie = new Cookie(CartConstant.TEMP_USER_COOKIE_NAME, userInfoTo.getUserKey());
            cookie.setDomain("yueshop.com");
            cookie.setMaxAge(CartConstant.TEMP_USER_COOKIE_TIMEOUT);
            response.addCookie(cookie);
        }

    }
}
